Didn't BSA own Triumph at that time, which would technically make both engines BSA.
It was a great programme, although stretched out a bit. But it held the interest of myself and my 25 year old daughter who still remembers, vividly, being taken to a real Wall of Death when she was around 5 years old (at Flook airfield, at the Cumbria Steam rally). I recall being taken to a Wall of Death at a visiting fair, by my Dad when I was in my early teens. Unforgettable.
And yes; the cyclist's performance was most impressive.
Marcus